docs: update todo tutorial patch body

Author: nabdelgadir

docs/site/todo-tutorial-putting-it-together.md

@@ -47,7 +47,7 @@ Here are some requests you can try:
 - `GET /todos/{id}` using the ID you received from your `POST`, and see if you
   get your Todo object back.
 - `PATCH /todos/{id}` using the same ID, with a body of
-  `{ "desc": "need milk for cereal" }`
+  `{ "title": "get the milk", "desc": "need milk for cereal" }`
 
 That's it! You've just created your first LoopBack 4 application!